st: Bug with pie charts: example

Rather than send out a data file, here is a generated dataset. The
biggest sector is x5, drawn blue. When I make the window very small
vertically, the plots turn orange. I was not able to get this effect
until x6 was added.
set obs 1500
gen x1=75+uniform()*10
gen x2=5+uniform()*1
gen x3=100-x1-x2
g x4= 120+uniform()*20
g x5= 300+uniform()*30
g x6=1
g year = round((_n+199)/200)
graph pie x5 x4 x1 x2 x3 x6, by(year)
Allan
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